BRAINCAKEReceptors in the Eye - Rod Cells
The retina of the human eye contains millions of light -sensitive receptors called rod cells and cone cells.
There are about 120 million rod cells in each eye.
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Key terms in this lesson
- generator potential
- A change in potential produced in a sensory receptor cell in response to a stimulus, which if it reaches the threshold triggers an action potential.
- summation
- The addition of the effects of multiple excitatory postsynaptic potentials, from several presynaptic neurones (spatial summation) or from repeated impulses in one neurone (temporal summation), so that the threshold for an action potential is reached.
- cone cell
- A light-sensitive receptor cell in the retina, concentrated in the fovea, that requires high light intensity, gives colour vision and high visual acuity.
More in Neuronal Communication
- Structural Organisation of the Nervous System
- Functional Organisation of the Nervous System
- The Autonomic Nervous System
- Comparison of Neurones
- Receptors in the Eye - Cone Cells
- Sino-Atrial Node
- Contraction of the Heart
- Autonomic Control of the Heart Rate
All 38 lessons in Neuronal Communication · All AQA A-level Biology topics